Glass-bait.



R. L. FRINK.

GLASS BAIT.

- APPLIOATION FILED MAY 13, 1907.

mums-SHEET 1.

.9 1 5 82 I Patented Mar. 16, 1909.

Patented Mar. 16, 1909.

R. L. FRINK.

GLASS BAIT.

APPLICATION FILED MAY 13, 1907.

Z1265 $5 W f UNITED. STATES rarnnr QEFITCEJ.

ROBERT L. ERINK'OF CLEVELAND, 'onro.

GLASS-BAIT,

' Application filed. May 13,1907. steamer-3,215 ,fi

To all whom it may concern:

Be it known that I, ROBERT L. FRINK, a citizen of the United States, resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Imrovement in Glass-Baits, of which the folowing is a specification, the principle of the invention being herein explained and the best mode in which'I have contemplated aplying that principle, so as to distinguish it rom other inventions.

My present invention has regard to improvements in apparatus for drawing glass, particularly glass cylinders in the manufacture of sheet or window glass. It will be obvious, however, that the general features of construction embodied in my improved apparatus may be beneficially adopted in other analogous situations.

The more especial object of the invention is to provide a bait for use in apparatus of this sort that will be free from the numerous difficulties attending the use of baits of the style at present employed, and that will hence materially facilitate the drawing of the glass and also reduce the loss incident to irregular cap-formation and the numerous other troubles incident to prevailing methods or ap aratus.

'o the accomplishment of these and related objects, said invention consists of the means hereinafter "fully described and particularly pointed out in the claims.

The annexed drawings and the following description set'forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings: Figure 1 represents a side elevation of a glass bait embodying the several improvements constituting my invention; Fig. 2 is a plan view of the hood forming one feature ofsuch baits construction; Fig.3 is a broken detail, in perspective of the bait proper Fig.4 is a side e evation, corresponding to. that in Fig. 1, of a slightly modified form of; baitgFig. 5 is a bottom planview of the same, Fig. 6 is abroken perspective view of apd'etail of .the bait member propenas in Fig.3; and 7 is a broken perspective View representing the disposition of the heating electric coil within the intermediate layer entering into the construction of the bait member proper.

The two forms of my invention shown in Specification of Letters Patent. resented starch 1c, aoei j "f the above drawings tojwhich desoriptiveref erence has just been made, are designed re spectively for. use in connection with drawing apparatus such as is in common use at present, and foremployment apparatus of the kind described iii-U- S. Letters Patent No. 846,102 issued tonne March 5, 1907.

Having regard, then-,;to .thc.first of these forms, A will be seen to designate a hood, preferably constructed oflight sheetmetal and of generally conical form. With the upper end of this hood connection is had through a; pipe (I with a suitable source of fluid pressure supply, 6. g.-- an air tank, such' as is ordinarily employed in connection with apparatus ofthc class in hand. The size of hood A is such that its lower OllGUlzLIfiilgG is of substantially the diameter. ofthe cylinder which it is desired to'drawi To suchjlower tachably, the bait men1ber,B, proper, Figs. 1 and Such bait member, 'here designed for drawim c 'linders is of course oi annular b i a 7 I form, corresponding with tne edge of the" hood in this respect, and consists, in the ap proved form illustrated, oi a hollow pipe section I) slit throughout its length on its upper side, as clearly appears in said Fig. 3. lVithin the hollow interior of the annular member thus provided, and conforming therewith so as to be substantially equidistantlyspaced matter of indilierence forming n'o' p'art of the present invention, such resistance'will ordi throughout its length from the contact of said annular member, is

narily he ecnstructezh inthe usual way-out of a conductor such as a wire do m-bled over'upon itself and the folds si'iita blydispcsed or bedded within annular inembei b"... flo 're taiu sue-n .i'ohlsot the conductor in'place an i llllOl' la 217- of insulating material 5 coni'orinmg to thennnersin-lace ,of the 'afr lar meniber aixlu'esaiu is crowded. Such' resistance I) is interposed in; a suitable e it ernal elec- V res trlcai circuit, flexible connection fbeihghad, through leadwn'es'b b consisting simply of the terminal portions of: (he ondue tor just described as constituting the resistance 1). The opening on the upper face oi the annular pipe section constituting the bait is closed by end is secured, in the present instance. de-

of the plate 6' latch 6 also mounted on the lower edge of 'of bait in connection with the 'Such blow1ngof th the hood, serves to prevent the bait from being accidentally detached.

The only modification introduced into my second form of bait consists in the substitution for the conical hood A of a cylindrical tube A of substantially the same diameter throughout. This tube is designed to be drawn upwardly between the same rolls A that are employed to subsequently draw the glass cylinder, and thatconstitute one feature of the invention set up in my patent earlier referred to. The construction of. the bait member, B, proper, as will be evident from inspection of Fig. 6, is the same as that shown in connection with the other form of hood. Instead, however, of having it detachably connected with the bend it may be permanently fastened thereto, to which end the coverplate b is made in two sections, one adapted to fit within, and the other without, the cylindrical wall of the hood or rather tube A.

The manner of use of my improved type prevailing apparatus is subout in usingthe The device is lowered into type of glass drawing stantially that followed ordinary bait.

the bath of metal until the ring,- or'annular bait member B, is sullieicntly ll'illllGTSGll therein to cause the metal to cling thereto and to be drawn upwardly when the device is in turn raised. By proper control of the current passing through the heating electrical resistance 1) such bait can be mainproper temperature to avoid any tained at a danger of the cylinder-breaking or cracking ofi from the bait, which is the most frequent annoyance entailed by the use of the present apparatus. The heat developed by the heating electrical currentis not only uniform about the entire periphery of the bait, but reaches the outer surface thereof, which is in actual contact with-the glass cylinder being drawn, by conduction from within. The superiority of this method of. heating the ca over any method where the'heat is applie by radiation at the line of attachment of cylinder to cap or bait should be readily apparent. Such danger of breakage 1s. further'decreased by'the fact that the bait is of substantially the same diameter as the cylinder being drawn, the hood A forming in 'efiect the ca which has heretofore. required to be, blown before the drawlng operation, proper, could be begun.

e cap, as is well'understood by those skilled in the art, is quite a delicate operation and any irregular formation thereof entails corresponding malformation of the cylinder with resultant imperfeet product. that there s no possibility of theair-opening I through the bait becoming clogged, as not infrequently happens where the-ordinary bait IS used. To gage the temperature of the bait a pyrometer of any standard make suitable for'registering the degree of heat involued, may be connected with the interior of annular member B. It is desirable It will furthermore be evident that such temperature be kept abovc'the second )oint of tension in the glass, that above the point wherethe glass comes to a set, glass men generally speaking of glass as l'iaving two points of tension, the first point being fron'i1200 to 1400 degrees F. where vitrification begins to take place, the second point being in the neighborhood of QQU degrees, F. The object in having the bait member detachable from the hood is to facilitate the removal of the completed cylinder. A number of bait members, in other words, may be employed with the single hood, such members being broken off from the cylinder at a later stage in the bandling of the latter.

The second form of my bait member involves no variations from the method of 9 type of drawing apparatus for use in con-.

nection with which it'is designed.

I should add in conclusion that the annular form in which my improved bait is here illustrated is notlonly the one which it is capable of assuming; for it is equally well adapted to the drawing of sheets as of cylinders and may be given any desired shape to correspond with the cross-sectional configuration of the article being drawn.

Other modes of a plyin g the principle of my invention may be em loyedinstead of the one explained, change beingmade as regards the mechanism herein disclosed, provided the means stated by any one of the following claims or the e uivalent of such stated means he employe( v I therefore particularly point out and dis- .tinctly claim. as my invcntion:--

I. A bait for drawing glass, comprising a member adapted to be lowered into and raised fromthe molten glass, and uniform electrical heating means disposed within said member approximately equidistantly throughout from the surface designed to contact with the glass, whereby such contacting surface. is heated substantially as described. 2. A bait for drawing glass cylinders, comprising an annular member adapted to be owered into and raised from the molten glass, and 'uniform electrical heating means within said member and co-extensivc therewith, said means being disposed substantially designed for 'sald ring and extending entirely around the 3 equidistantly from the face of said member designed for contact with the glass, whereby such face is heated by conduction from within, substantially as described. 3. A bait for drawing glass cylinders, comprising an annular member adapted to be lowered into and raised from the molten glass, the face of said'member designed to contact with the glass being transversely curved, and uniform electrical heating means disposed within said member substantially equidistantly from such curved face, whereby such face is heated substantially as described.

4. A- bait for drawing glass cylinders, comprising a hollow annular metallic member adapted to be lowered into and raised from the molten glass, the face of said member contact \yithjhe glass being of approximately circular cross section, a uniform heating electrical resistance disposed within said member and co-extensive therewith, said resistance being substantially equidistant throu hout from such curved face, and external circuit connections for said resistance.

5. A bait for drawing glass cylinders, comprising a hollow iron ring s lit open on its upper side and of substantially the diameter 0, ..the cylinder to be drawn, said ring being adapted to be-lowered into and raised from the molten glass, a uniform heating electrical resistance disposed against the inner walls of the latter whereby same, whereby the outer surface of said ring designed for contact with the glass is maintained at uniform temperature, and external circuit connections for said resistance.

6. A bait for drawing glass, comprising a hood member provided about with a plurality of parallel projecting lu s, and an annular balt member, proper, e signed for contact with the glass, said bait member being provided with hooks adapted to en age the lugs on said hood member, where y the one member may be detach ably secured to the other.

7. A bait for drawin glass, comprising a hood of general conical orm adapted to provide a cap for the cylinder to be drawn, said hood being provided about its lower edge with aplurality of parallel projecting lugs, fluid pressure connections for said hood, a hollow annular member of the same diameter as the lower edge of said hood and provided with hooks adapted to engage the lugs on said member may be detachably secured to'said hood, a heating electrical resistance disposed within said mem er, and external circuit connections for said resistance. 4 Signed by me this 10th day of May, 1907.

ROBERT L. FRINK.

Attested by- MARY ISRAEL, .lNO. F. OBERLIN.

its lower edge a 

